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When I was a little kid, i thought that when you drank water it went down one tube and that you eventually peeed that out. When you ate solid material i.e. bread streak etc it would go down another tube and come out your rear end. I had all that worked out fine but then i pondered. What would happen if i ate soup? or Yogurt? I pondered that question for a very long time and attempted to find out where the fine line was and how your body knew